304 CONTKIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV, 



14§.— STEJVODUS Richardson. 

 Inconnus. 

 (Luciotnitta Giiuther.) 

 (Richardson: type Sahno maclcenzii Rich.) 



Body rather elongate, little compressed. Head long, the cleft of the 

 mouth wide. Maxillary long, broad, lanceolate, extending far backward, 

 lower jaw projecting much beyond the upper. Dentition very feeble, 

 the teeth extremely small ; maxillary toothless; vomer, palatines, and 

 tongue with narrow bauds of minute villiform teeth. Gill-ralcers rigid, 

 awl-shax^ed, rough interiorly. Branchiostegals 10. Pyloric cceca iu 

 great number. Dorsal fin moderate, over ventrals; anal rather long; 

 caudal forked. Scales moderate. Coloration silvery. Migratory trout 

 of large size, inhabiting the streams of Arctic America and Asia, 

 (ffrivo?, narrow; ddoh^^ tooth.) 



49§. S. EEiaclieaiziii Richardson. — Inconnu. 



Body elongate, subterete. Head long and compressed, with flattened 



vertex. Eye moderate. Preopercle much curved. Dorsal fin nearer 



caudal than snout. Bluish above; sides silvery, as in the Coregoni. 



Head oh. B. 10; D. 13; A. 15; scales 11-lOG-lO. Mackenzie's Eiver 



and its tributaries. 



(Salmo madcunz'd Richardson, Franklin's Journ. 1823, 707 : Liicioirutta mackenziei 

 Giinther, vi, 164.) 



149.— OIVCOS2EI¥iVCE5U§ Suckley. 

 Facific Salmons. 

 (Suckley, Ann. Lye. Nat. Hist. N. Y. 18G1, 312: type Salmo scoulerl Rich.) 



Body elongate, subfusiform or compressed. Mouth wide, the maxil- 

 lary long, lanceolate, usually extending beyond the eye; jaws with 

 moderate teeth, which become in the adult male enormously enlarged 

 in front. Vomer long and narrow, flat, with a series of teeth both on the 

 head and the shaft, the latter series comparatively short and weak; 

 palatines with a series of teeth; tongue with a marginal series on each 

 side; teeth on vomer and tongue often lost with age; no teeth on the 

 hyoid bone. Branchiostegals more or less increased iu nnmber. Scales 

 moderate or small. Dorsal fin moderate; anal fin comparatively elon- 

 gate, of 11-20 rays. Pyloric appendages in increased number. Gill- 

 rakers rather nnmerous. Ova large. Sexual peculiarities very strongly 

 developed; the snout in the adult males in summer and fall greatly 

 distorted ; the premaxillaries prolonged, hooking over the lower jaw, 

 which in turn is greatly elongate and somewhat hooked at tip; the 



